Patent GB-723572-A (GB)
Title: Improvements in or relating to x-ray apparatus
IPC: A61B6/04
Filed: 1952-05-29
Abstract: 723,572. X-ray apparatus. SIEMENS-REINIGER-WERKE AKT.-GES. May 29, 1952 [May 30, 1951; Oct. 15, 1951; Dec. 12, 1951], No. 13733/52. Class 98 (1). In X-ray apparatus having a frame which supports a patient's couch or table top and which is pivoted about a single horizontal axis and adapted to be locked in any desired pivoted positions, the frame is so mounted in bearing members pivoted about the horizontal axis that it can be displaced in its longitudinal direction and locked in the position into which it is displaced. As shown in Figs. 1 and 2, plates 6, 7 are pivoted in ball bearings to brackets 1, 2 on a fixed base. Members 16, 18 forming the longer sides of a frame each have three U- sectioned rails mounted thereon. Rails 20, 22 engage rollers 10, 11, 12, 13 on plates 6, 7 to enable the frame to move longitudinally with respect to the supporting plates. Rollers 25, 26 on a carriage 31 engage rails 21, 23. An X-ray tube 28 and a diaphragm housing 29 are slidable on carriage 31 and are connected through telescopic members 27, 27a to a support 32 for a fluorescent screen 33 and a cassette 34, and to a counterweight 45. The table top 39 is mounted on a carriage having rollers 35, 35a, 36, 36a engaging rails 17, 19 and itself having rails 40, 41 in which a cassette carriage 42 travels. A sector-shaped toothed plate 54 is fixed to the bracket 1 and engages a rack 57 fixed to the rail 20, and the plates 6, 7 have teeth engaging pinions 49, 50 driven by a motor 48. By this means the frame can be tilted and at the same time moved longitudinally with respect to the support. Instead of being fixed to the bracket 1, plate 54 may be rotatable about the pivot axis of the table by the motor 48 or by separate driving means. The rack 57 and plate 54 may have elliptical shapes. In a modification shown in Fig. 5, a spar 68 is slidable in a support 65 fast with a shaft 64 pivoted in fixed brackets 62, 62<SP>1</SP>, and together with end pieces 69, 70 forms a support on which the table top 72 is slidably or fixedly mounted. A carriage 75 for an X-ray tube and fluorescent screen slides under the table top. The table is tilted about the axis of shaft 64 as by a motor engaging teeth on a circular part of the periphery of support 65. A sleeve loosely mounted on shaft 64 is connected to a system of linked levers to the spar 68, so that when the table is tilted anticlockwise from the horizontal spar 68 is held stationary with respect to support 65, the pivot axis being so arranged that the end 70 does not reach the floor until the table top is vertical; but when the table is tilted clockwise from the horizontal, spar 68 is moved longitudinally with respect to the support until the end piece 69 touches the floor with the table at 45 degrees thereto. A lever system 91 prevents the carriage 75 from reaching the end in this case. In another modification, the table is constructed and mounted for pivoting in a manner similar to that shown in Fig. 5, but the longitudinal movement of the table is effected by a gear wheel engaging a rack on the table instead of by a linkage. A single motor may pivot the table and also drive the pinion, the drives being effected through separately operable clutches if desired.